Improvement in locomotive spark-arresters



J. HEWITT. Locomotive Spark-Arrester.

No. 198;"0. Patented Dec. 11,187

N.PETERS\ FHDTOLITHOGRAFHER, WASHKNGTON. n c.

\ UNITED STATES'PATENT. OFFICE.

JOHN HEWITT, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN I LOCOMOTIVE SPARK-ARRESTERS.

' Specification forming part of Letters Patent No. 198,110, datedDecember 11, 1877 application filed October 8, 1877.

To all whom it may concern:

Be it known that I, JOHN HEWITT, of St. Louis, Missouri, have made a newand useful Improvement in Locomotive Spark-Arresters, of which thefollowing is a full, clear, and exact description, reference being hadto the an nexed drawings, making part of this speoifica tion, in which-Figure 1 is an elevation, partly in section, of a smoke-stack embodyingthe improvement; and Fig. 2, a horizontal section taken on the line w wof Fig. 1.

Similar letters refer to similar parts.

Attempts have heretofore been made, in the construction oflocomotivestacks, to pulverize and extinguish the sparks before theirissue from the stack; but the constructions referred to, in addition tobeing complicated and expensive, have generally proved unreliable.

The present invention relates to an improved means for accomplishing theobject referred to;

Referring to the annexed drawings, A rep resents the stack of alocomotive, enlarged at its upper end a, in the usual manner. Adeflector, B, forms an extension to the shell 1, extending at firstupward therefrom, and then curving inward, and then downward,substantially as shown in Fig.1. 0 and D represent, respectively, twohollow cones (so called) arranged one above the other centrally withinthe stack and pointing downward.

Their form and position may be more particularly described as follows:The cone 0 is conical in outline, and is arranged so that its apex is atthe level, or thereabout, of the commencement of the enlargement a ofthe stack, and the body of the cone extending thence upward into thepart a.

The cone D is truncated in its general form, and is arranged so that itslower end is within the upper end of the cone 0, thereby forming anannular flue, c. It extends thence upward (forming, with the shell a,the flue E) above the part a until it is opposite the lower part of thedeflector B, and at this point d it is considerably larger in diameterthan the mouth F of the stack. Thence the cone D extends upward parallelwith the deflector, and to the level ,of the lower end of the mouth Fthence, following the curve of the deflector, it curves upward, inward,and downward to the level of the lower end of the mouth F, forming anextension, 6, of

extension 6, and against the deflector B. The

force of the steam, as is well understood, is sufficient to cause thesparks to be carried upward with great force. By reason of the shape andarrangement of the flue e the sparks, after encountering the deflector,are caused to be thrown in a direction directly opposite to that takenby the steam in its ascent through the mouth F, and to the bottom of thecone D, and thence into the cone 0, whence, by the continued action ofthe escaping steam, they are, through the flue c, sucked out into theflue E, and are again thrown upward against the deflector, to be againreturned, through the flue e, to the cone 0, and again sucked out andthrown upward, as before, and so on, round and round, until, by repeatedcollision with and abrasion upon the deflector D, the fire is beaten outof the sparks, and by this time the sparks will have become pulverizedto such an extent as to render them too light to be thrown downward fromthe flue c any longer,

and they are carried off directly with the escaping steam.

To prevent the steam, as it escapes from the flue e, from causing aneddy within the cone 0, I arrange a shield, G, within the cone D,

- care being taken to leave a sufficient annular space between theshield and cone for the de: scending sparks to pass down into the cone0. The shield is preferably conical in form, as shown, and is supportedby the connections 9 g.

By reason of the shape and arrangement of the cone D and the flue E e, Iam enabled to dispense with the netting that commonly is used at themouth of the stack, for, the upper end of the cone D being much largerthan the v mouth of the stack, and the curvature of the deflector beingsuch as to point the mouth of the flue 0 directly away from the mouth ofthe I 2. The combination of the stack A, destack, the sparks areeffectually prevented flector B, cones O, D, and G, and flues c E e,from going in the direction of the mouth F unsubstantially as described.til they are thoroughly pulverized.

I 01ain1 JOHN HEWITT. 1. The combination of the stack A, deflector B,cone 0, and cone D, the latter being ex tended upward, as described, toform the flue E and extension 0, substantially as set forth.

Witnesses CHAS. D. MOODY, HERM. GUELs.

